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Unoccupied-Band Narrowing in Na and its Effect on the X-Ray-Absorption K Edge

1988; American Physical Society; Volume: 61; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.61.1021

1092-0145

P. H. Citrin, G. K. Wertheim, T. Hashizume, F. Sette, Alastair A. MacDowell, F. Comin,

X-ray Spectroscopy and Fluorescence Analysis

The first Na $K$-edge absorption measurements are reported. The data reveal a narrowing of the unfilled density of states analogous to that observed in a recent photoemission study of the conduction band and in very good agreement with new band-structure calculations. The narrowing is found to be essential for obtaining compatibility among the $K$-edge threshold exponent, the ${L}_{2,3}$-edge exponent, and the singularity index in core-level photoemission.